{"id":"F2006B08082","name":"AD/CESSNA 210/33 - Auto Pilot System - Disabling and Modification","slug":"ad-cessna-210-33-auto-pilot-system-disabling-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115183,"registerId":"commonwealth-F2006B08082-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 210/33 - Auto Pilot System - Disabling and Modification","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nCessna 210 Series Aeroplanes\n\nAD/CESSNA 210/33 Auto Pilot System \\- Disabling\n\nand Modification\n\n  \n6/78\n\nApplicability: Models 210M, T210M and P210 with S/Nos. 21061574 to 21062583 and P2100001 to P2100010 incorporating ARC Model 400B Auto Pilot installations.\n\nRequirement: 1. On aircraft not modified in accordance with Cessna SLAV78-6 dated 31 March 1978 or later revision, disable the Model 400B autopilot by disconnecting the connectors at the roll and pitch actuators and securing these connectors to prevent them from interfering with the flight controls.\n\n    2. Install a placard in plain view of the pilot indicating: “AUTO PILOT INOPERATIVE”.\n    3. Upon accomplishment of the electrical autopilot actuator modification set forth in Cessna SL No. AV78-6, the autopilot may be returned to service and the “AUTO PILOT INOPERATIVE” placard removed.\n\nCompliance: Before further flight using auto pilot. With autopilot disengaged the aircraft may be flown to a place where the maintenance required by paras. 1 and 2 may be carried out if such a flight has been authorised by the issue of a permit to fly pursuant to ANR 108A.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific airworthiness issue with a specific autopilot installation. It has not expanded beyond its original purpose of addressing the ARC Model 400B defect in defined Cessna 210 variants."},"complexity_factors":["Single, specific applicability: only 3 aircraft models with defined serial number ranges","Only 3 straightforward requirements (disconnect, placard, restoration procedure)","No defined terms section or interpretation provisions","Single cross-reference to external Cessna Service Letter (SL AV78-6)","One conditional compliance pathway (permit to fly under ANR 108A for relocation flights)","Total length: approximately 150 words of operative text"],"plain_english_summary":"This CASA Airworthiness Directive orders owners/operators of specific late‑1970s Cessna 210M/T210M/P210s fitted with the ARC Model 400B autopilot to immediately disable the unit (disconnect roll and pitch controls and secure wiring) and fit a visible “AUTO PILOT INOPERATIVE” placard. It affects aircraft owners and maintenance engineers and can only be reversed after installation of Cessna’s Service Letter AV78‑6 factory modification. A restricted fly‑to‑base option with a permit to fly is allowed to reach a repair facility."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies only to the explicitly listed models, serial number ranges and ARC Model 400B installations (Applicability, Requirement). The text sets a clear interim remedy (disable and placard) and a re-entry condition (Cessna SL AV78‑6); it does not indicate any expansion or narrowing of scope beyond those stated terms."},"complexity_factors":["Narrow applicability limited to specific models and serial numbers (Applicability).","Technical maintenance action required: disconnecting and securing roll and pitch actuator electrical connectors (Requirement, para. 1).","Temporary operational limitation required: installation of a visible placard ‘AUTO PILOT INOPERATIVE’ (Requirement, para. 2).","Restoration conditional on completing a specified manufacturer modification (Cessna SL AV78‑6) (Requirement, para. 3).","Timing and operational constraint: compliance required before further flight using autopilot (Compliance).","Regulated ferry option: aircraft may be ferried to a maintenance location only with an authorised permit under ANR 108A (Compliance), introducing administrative discretion and potential delay.","Compliance burden falls on owners/operators (cost, maintenance time, temporary loss of autopilot capability)."],"plain_english_summary":"This airworthiness directive requires certain Cessna 210M/T210M/P210 aeroplanes with ARC Model 400B autopilot installations to have that autopilot physically disabled (disconnect and secure the roll and pitch actuator connectors) and a visible “AUTO PILOT INOPERATIVE” placard until the aircraft is modified per Cessna SL AV78‑6. It affects owners/operators of the listed serial-numbered aircraft, who bear the maintenance and placarding cost and may need an authorised permit to ferry the aeroplane for the work."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-210-33-auto-pilot-system-disabling-and-modification","history":"/api/acts/ad-cessna-210-33-auto-pilot-system-disabling-and-modification/history","analysis":"/api/acts/ad-cessna-210-33-auto-pilot-system-disabling-and-modification/analysis","conflicts":"/api/acts/ad-cessna-210-33-auto-pilot-system-disabling-and-modification/conflicts","importantCases":"/api/acts/ad-cessna-210-33-auto-pilot-system-disabling-and-modification/important-cases","documents":"/api/acts/ad-cessna-210-33-auto-pilot-system-disabling-and-modification/documents"}}